CAC Payback Calculator for SaaS growth teams
Calculate how many months it takes to recover customer acquisition cost, estimate LTV/CAC, and quickly understand whether your acquisition model is healthy, risky, or expensive.
What this calculator shows
CAC payback is one of the clearest ways to see whether paid acquisition, outbound, or GTM spend can scale without eating your cash runway.
Inputs
Enter your acquisition and revenue assumptions. The calculator updates instantly.
Results
Use these outputs to judge campaign and GTM efficiency.
What is CAC payback?
CAC payback measures how long it takes to recover the money spent to acquire a customer. In SaaS, it is usually calculated using gross profit, not just revenue, because delivery costs matter.
- Under 6 months: very strong acquisition efficiency.
- 6–12 months: healthy for many SaaS companies.
- 12–18 months: workable, but requires strong retention and cash discipline.
- 18+ months: risky unless ACV, expansion, or retention is excellent.
CAC payback formula
CAC payback period = CAC / monthly gross profit per customer
Example: if CAC is $1,200, monthly revenue is $250, and gross margin is 80%, monthly gross profit is $200. CAC payback is 6 months.